Dual screen display for mobile computing device

ABSTRACT

A mobile computing device is disclosed for displaying backlight and diffuse reflecting information. The mobile computing device is configured to include a processor, a first LCD display unit connected to the processor, and a second diffuse reflecting display unit connected to the processor. The mobile computing device is further provided with a display panel interface, such as a mouse or a gravity detecting device like an accelerometer, configured to detect a property for activating a display type. The processor is configured to send information to be displayed to the first display unit or the second display unit or both depending on the display type property detected.

TECHNICAL FIELD

The present disclosure relates to mobile computing devices and moreparticular to displays for a mobile computing device.

BACKGROUND

High demand exists for mobile computing devices that can be usedanywhere anytime. One limitation placed on this demand are the displaysused in these devices.

Conventional mobile computing devices use backlit displays to displaytext or an image. One such display is a liquid crystal display. Thesedisplays use a variety of liquid crystal substances that have a uniquefeature of being affected by electrical current. For example, aparticular form of liquid crystal is the nematic liquid crystal calledtwisted nematics which are naturally twisted. Applying an electriccurrent to these crystals will untwist them to varying degrees dependingon the voltage. Because the crystals react predictably to electriccurrent, the electric current can be used to control the passage oflight through the crystal.

Liquid crystals do not emit light of their own. External lighting mustbe applied to the crystal in order that light from the crystal can beseen. Backlighting may be provided by any light source such as afluorescent tube, LEDs, lasers, or other sources of light. Inconventional backlit displays used on mobile computing devices, thecomputer display is typically lit with built-in fluorescent tubestypically located behind the LCD. Depending upon the orientation of theliquid crystals under the influence of an applied voltage, there is morelight or less backlight that is allowed to pass through the crystals.That provides the dark and light points of light coming from the liquidcrystal display that together form the text or image that is seen on thedisplay screen by the user.

The readability of back lit displays is generally inversely proportionalto ambient light. This is because the lighting for backlit display comesfrom the backlight. When the ambient light is dark or where lighting isscarce, there is no or little light reflecting off the liquid crystaldisplay to interfere with the backlighting that is shining through theliquid crystal display. For that reason, a backlit display can be easilyread in the dark or where lighting is scarce. Where, however, theambient light is too strong, the readability of the backlit displaydegrades on account of the interference between the strong ambient lightreflecting off of the liquid crystal display and the backlight that iscoming from the liquid crystal display. In addition, the human eyeresponds to high ambient light by closing the iris resulting in makingthe light in the back light display appear dimmer. For these reasons,backlit displays are difficult to read when the ambient or outdoor lightis strong. In direct sunlight, such as on the beach, the interferencemay be so great that the backlit display may be impossible to read.

A relatively new technology for displaying text and images that isbecoming increasing popular on account of e-books is electronic paper.Electronic paper, e-paper and electronic ink are display technologieswhich are designed to mimic the appearance of ordinary ink on paper.Unlike conventional backlit flat panel displays which emit light,electronic paper displays reflect light like ordinary paper. Otherapplications of electronic visual displays include electronic pricinglabels in retail shops, and digital signage, time tables at busstations, electronic billboards, and e-paper magazines. Some devices,like USB flash drives, even use electronic paper to display statusinformation, such as available storage space. E-ink is less popular withcell phones although Motorola makes one cell phone with an e-ink displayknown as the E3.

Diffuse reflecting technology, such as e-ink, is particularly useful fore-books because it has low refresh rates compared to other low-powerdisplay technologies, such as LCD. The low refresh rates allow for amore stable image, since there is no need to refresh the imageconstantly which can make an e-ink display more comfortable to read. Thelow refresh rates also reduce the power requirements for displaying textand images. Indeed, some e-ink technologies require very little or norefresh at all and so can even hold the static text and imagesindefinitely without using electricity, except when changing to anotherimage. The technology of e-ink can also allow for a wider viewing anglethan is possible with an LCD display.

The low refresh rate possible with e-ink however makes e-ink displaysnot well suitable for sophisticated interactive applications, such asfast moving menus, mouse pointers or scrolling. For example, a documentdisplayed using e-ink cannot be zoomed quickly or smoothly without someblurring. This is one reason why computing devices such as laptops,tablets, and mobile devices tend to use LCD displays and not e-ink forthe display

Both the LCD and the e-ink displays illustrate how conventionalcomputing devices are indeed limited by their display to when and wherethey can be used. The readability of e-ink displays improve withstronger ambient light while the readability of LCD displays degrades inthose conditions. The LCD displays are most readable when there is lowor no ambient light. The e-ink displays cannot be read in thoseconditions. The low refresh rates for e-ink allow for a more stableimage. However, those low refresh rates inhibit the use of e-ink withsophisticated interactive applications. The paradox is that when outsideand the sun is shining, one person is unable to see a thing on hisbacklit computer while the other is reading his book on a Kindle™ withthe e-ink. Similarly, a delivery woman has no problem reading the e-inkon an e-ink display. But she has to take off her sunglasses and shelterthe display from the direct sunlight in order to see anything on abacklit display.

There is a need to meet the high demand for mobile computing devicesthat can be used anywhere anytime under wider lighting conditions, withmore sophisticated interactive applications, and with lower powerrequirements. This disclosure addresses that need.

SUMMARY OF THE INVENTION

A mobile computing device is disclosed for displaying backlight anddiffuse reflecting information. The mobile computing device isconfigured to include a processor, a first display unit connected to theprocessor, and a second display unit connected to the processor. Themobile computing device is further provided with a display panelinterface configured to detect a property for activating a display type.The processor is configured to send information to be displayed to thefirst display unit or the second display unit or both depending on thedisplay type property detected. Illustratively, the first display unitis configured to provide a backlit display and the second display unitis configured to provide a diffuse reflecting display.

The display panel interface of the mobile computing device may be atouch activated sensor and the property detected for activating thedisplay type may be a touch detected by the sensor. Illustratively, thetouch activated sensor may include a first touch activated sensorassociated with the first display unit and a second touch activatedsensor associated with the second display unit, wherein the touchdetected by the touch activated sensor is a touch detected by the firsttouch activated sensor or a touch detected by the second touch activatedsensor, and wherein the touch detected by the first touch activatedsensor activates the first display unit and the touch detected by thesecond touch activated sensor activates the second display unit.

Alternatively, the display panel interface may include a touch activatedsensor that detects the form of the touch—such as by the number of timesthat the touch activated sensor is touched or the number of fingerstouching the touch activated sensor—and then activates the display typedepending upon the form of the touch. Illustratively, a first number oftimes of touch of the touch activated sensor may activate the firstdisplay unit and a second number of times of touch of the touchactivated sensor may activate the second display unit. Alternatively, afirst number of fingers touching the touch activated sensor may activatethe first display unit and a second number of fingers touching the touchactivated sensor may activate the second display unit.

In some embodiments, the display panel interface is a gravity detectiondevice, such as an accelerometer, and the property detected foractivating the display type depends on which of the first display unitor the second display unit is facing in the upward direction.

The mobile computing device may be further provided with a displaycontroller having display controller settings, wherein the processor isconfigured to update the display controller based on the display typeproperty detected. A memory associated with the mobile computing devicemay also be configured to store properties of the backlit display andthe diffuse reflecting display.

The mobile computing device may be a hand held terminal, a laptopcomputer, a smart phone, or any mobile computing device. In anillustrative embodiment, the display unit is configured to serve as amouse.

In an illustrative embodiment, the first display unit may be located ona first side of the mobile computing device and the second display unitmay be located on a second side of the mobile computing device.Illustratively, the first side of the computing device may be the frontof the mobile computing device and the second side of the computingdevice may be the back of the computing device. In another illustrativeexample, the second display unit is configured to serve as a mouse.Alternatively, the second display unit may be configured to serve as amouse pad. According to this disclosure, a mouse is defined to be “astand-alone device used for navigation purposes” as opposed to a “mousepad” which is defined to be “a flat touch-sensitive device used fornavigation purposes.” Alternatively, the first display unit and thesecond display unit of the mobile computing device may be located on thesame side of the mobile computing device. In an illustrative example,the side of the mobile computing device on which the first display unitand the second display unit are located may be the front side of themobile computing device. In other embodiments, the first display unitconfigured to provide a back lit display and the second display unitconfigured to provide a diffuse reflecting display may be integratedinto a single display package so that one overlays the other. In someembodiments, the diffuse reflecting display of the second display unitmay be configured to provide a diffuse reflecting display of dashboardinformation.

In other embodiments, the mobile computing device is in the form factorof a clam shell including a display part and a keyboard part. The firstdisplay unit and the second display unit may reside in the display partin this embodiment and may be rotatable about a swivel member connectingthe display part to the keyboard part when the display part is in aposition that is orthogonal to the keyboard part. The swivel memberallows either the first display unit or second display unit to face inthe direction of the keyboard part of the mobile computing part for usein a first set of operations. The display unit facing away from thekeyboard part of the mobile computing device may be used in a second setof operations even contemporaneously with the first of operations thatare being performed using the display unit facing toward the keyboardpart of the computing device. In another embodiment, the display unitfacing away from the keyboard part of the mobile computing device maybecome the display face of the mobile computing device when the displaypart is closed onto the keyboard part of the mobile computing device. Inan illustrative embodiment, the display unit facing away from thekeyboard and that becomes the face of the mobile computing device whenthe display part is closed against the keyboard part serves as a tablet.

In an illustrative method of displaying information from a mobilecomputing device includes detecting a property for activating a displaytype; and sending information to be displayed to a first display unit ora second display unit depending on the display type property detected.In an illustrative embodiment, the method further includes the steps ofconfiguring the first display unit to provide a backlit display; andconfiguring the second display unit to provide a diffuse reflectingdisplay.

Other embodiments are also disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a functional diagram of a mobile computing device accordingto this disclosure.

FIGS. 2 and 3 show an illustrative cross-section and aerial view,respectively, of a backlit display useable with this disclosure

FIGS. 4 and 5 show an illustrative cross-section and aerial view,respectively, of an e-ink display useable with this disclosure

FIGS. 6 and 7 illustrate a mobile computing device illustrated as asmart phone having a front side with a keyboard and a back side,respectively.

FIG. 8 shows another illustrative embodiment where both the firstdisplay unit and the second display unit are located on the same side ofthe mobile computing device. FIG. 8A shows an illustrative embodimentwhere the second display is configured to frame the first display in aframe configuration.

FIG. 9 shows a mobile computing device in the form factor of a handheldterminal with scanner functionality and with both an LCD first displayunit and an e-ink second display unit located on the front side of thedevice and the e-ink display unit displaying a dashboard of life data.

FIG. 10 shows a mobile computing device with a first display unit and asecond display unit both LCD displays, and the second display unitconfigured to serve as a mouse.

FIG. 11 shows a first display unit configured to provide a back litdisplay and the second display unit configured to provide an e-inkdisplay integrated into a single display package so that one overlaysthe other.

FIG. 12 shows another illustrative example of two display unitsconfigured into a single display package so that one overlays the other.

FIGS. 13 and 14 show illustrative embodiment similar to FIGS. 6 and 7further comprising a first touch activated sensor on a first displayunit and a second touch activated sensor on a second display unit. FIG.13 also shows an accelerometer used to provide another display panelinterface.

FIGS. 15, 16, 17 illustrate a mobile computing device in the form-factorof a claim-shell in three different positions showing variousillustrative benefits of the mobile computing device configured to havetwo display units.

FIGS. 18 and 19 show illustrative processes for operating a mobilecomputing device configured to have two display units according to thisdisclosure.

DETAILED DESCRIPTION

A mobile computing device is disclosed for displaying backlight anddiffuse reflecting information. The mobile computing device isconfigured to include a processor, a first display unit connected to theprocessor, and a second display unit connected to the processor. Themobile computing device is further provided with a display panelinterface configured to detect a property for activating a display type.The processor is configured to send information to be displayed to thefirst display unit or the second display unit or both depending on thedisplay type property detected. In an illustrative example wherein theprocessor is configured to send information to both display units, theprocessor may send text or image data on a particular subject to onedisplay unit while providing the other display unit with an animatedlogo or company information for display. Illustratively, the firstdisplay unit is configured to provide a backlit display and the seconddisplay unit is configured to provide diffuse reflecting display.

The display panel interface of the mobile computing device may be atouch activated sensor and the property detected for activating thedisplay type may be a touch detected by the sensor. Illustratively, thetouch activated sensor may include a first touch activated sensorassociated with the first display unit and a second touch activatedsensor associated with the second display unit, wherein the touchdetected by the touch activated sensor is a touch detected by the firsttouch activated sensor or a touch detected by the second touch activatedsensor, and wherein the touch detected by the first touch activatedsensor activates the first display unit and the touch detected by thesecond touch activated sensor activates the second display unit.

Alternatively, the display panel interface may include a touch activatedsensor that detects the form of the touch—such as by the number of timesthat the touch activated sensor is touched or the number of fingerstouching the touch activated sensor—and then activates the display typedepending upon the form of the touch. Illustratively, a first number oftimes of touch of the touch activated sensor may activate the firstdisplay unit, a second number of times of touch of the touch activatedsensor activating the second display unit, and a third number of timesactivates both displays. Alternatively, a first number of fingerstouching the touch activated sensor may activate the first display unitand a second number of fingers touching the touch activated sensor mayactivate the second display unit.

In some embodiments, the display panel interface is a gravity detectiondevice, such as an accelerometer, and the property detected foractivating the display type depends on which of the first display unitor the second display unit is facing in a particular direction, such asin a generally upward direction.

The mobile computing device may be further provided with a displaycontroller having display controller settings, wherein the processor isconfigured to update the display controller based on the display typeproperty detected. A memory associated with the mobile computing devicemay also be configured to store properties of the backlit display andthe diffuse reflecting display.

The mobile computing device may be a hand held terminal, a laptopcomputer, a smart phone, or any other mobile computing device. In anillustrative embodiment, one display unit is configured to serve as astand alone mouse device. Alternatively, the display unit may beconfigured to serve as a flat touch-sensitive device known as a mousepad.

In an illustrative embodiment, the first display unit may be located ona first side of the mobile computing device and the second display unitmay be located on a second side of the mobile computing device.Illustratively, the first side of the computing device may be the frontof the mobile computing device and the second side of the computingdevice may be the back of the computing device. In another illustrativeexample, the second display unit is configured to serve as a mouse or amouse pad. Alternatively, the first display unit and the second displayunit of the mobile computing device may be located on the same side ofthe mobile computing device. In an illustrative example, the side of themobile computing device on which the first display unit and the seconddisplay unit are located may be the front side of the mobile computingdevice. In other embodiments, the first display unit configured toprovide a back lit display and the second display unit configured toprovide a diffuse reflecting display may be integrated into a singledisplay package so that one overlays the other. In some embodiments, thediffuse reflecting display of the second display unit may be configuredto provide a diffuse reflecting display of dashboard information.

In other embodiments, the mobile computing device is in the form factorof a clam shell including a display part and a keyboard part. The firstdisplay unit and the second display unit may reside in the display partin this embodiment and may be rotatable about a swivel member connectingthe display part to the keyboard part when the display part is in apredetermined position, such as being generally orthogonal to thekeyboard part. The swivel member allows either the first display unit orsecond display unit to face in the direction of the keyboard part of themobile computing part for use in a first set of operations. The displayunit facing away from the keyboard part of the mobile computing devicemay be used in a second set of operations even contemporaneously withthe first of operations that are being performed using the display unitfacing toward the keyboard part of the computing device, such asdisplaying advertising or a logo. In another embodiment, the displayunit facing away from the keyboard part of the mobile computing devicemay become the display face of the mobile computing device when thedisplay part is closed onto the keyboard part of the mobile computingdevice. In an illustrative embodiment, the display unit facing away fromthe keyboard and that becomes the face of the mobile computing devicewhen the display part is closed against the keyboard part serves as atablet.

In an illustrative method of displaying information from a mobilecomputing device includes detecting a property for activating a displaytype; and sending information to be displayed to a first display unit ora second display unit or both depending on the display type propertydetected. In an illustrative embodiment, the method further includes thesteps of configuring the first display unit to provide a backlitdisplay; and configuring the second display unit to provide a diffusereflecting display.

The foregoing has described generally the disclosure. We now turn toelaborating features of this disclosure.

FIG. 1 is a functional diagram of a mobile computing device 100. Mobilecomputing device 100 according to this disclosure includes a processor104; a first display unit 140 connected to the processor; a seconddisplay unit 160 connected to the processor; and a display panelinterface 110. The mobile computing device further includes a displaycontroller 108, a memory 106, and a source of power 102. While FIG. 1shows a processor 104, it will be appreciated that more than oneprocessor may also be used in accordance with this disclosure.

Mobile computing device 100 can be a handheld terminal, a lap topcomputer, a smart phone, a handheld personal digital assistant (PDA), awireless mobile phone, a pager, an industrial grade mobile computer withscanning functionality (e.g., bar code scanning, image capture, opticalcharacter recognition (OCR), etc.), or any other mobile computingdevice.

Processor 119 can be any microprocessor capable of accessing informationstored in memory unit 106, performing actions based on instructionsusing information from memory unit 106 or some other source, andalternatively storing information in memory unit 106 or transmittinginformation. An example of transmitting information can be sendinginformation to be displayed on first display unit 140 or second displayunit 160.

Power source 102 can be a battery or fuel cell, a direct line from awall outlet, current from a solar cell or any other power sourcesufficient to satisfy the power requirements for mobile computing device100. Memory unit 106 can be any form of data storage. It may be at leastone of random access memory (RAM) and/or read only memory (ROM).Information can be stored permanently until overwritten and/or storedtemporarily for use while the unit is active.

Display unit 140 and display unit 160 can include a visual displaycapable of displaying data transmitted from processing unit 104. Displayunit 140 and 160 can include a LCD screen, e-paper, or other bi-stabledisplay, a CRT display or any other type of visual display.

Illustratively, display unit 140 is an LCD backlit display and displayunit 160 is an e-ink display. Alternatively, display unit 140 may be anyother light emitting display known in the art and display unit 160 maybe any diffuse reflecting display (i.e., a display based upon diffusereflecting technology). An illustrative cross-section of a backlitdisplay 140 useable with this disclosure is shown in FIG. 2. The LCDdisplay 140 is a illustratively a layered panel 140 comprising a glasscover 141 overlaying a polarizing film 142 overlaying a glass filter 143overlaying a positive electrode 144. A liquid crystal layer 145 issandwiched between the positive electrode 144 and a negative electrode146. The negative electrode 146 overlays a glass filter 147 overlayingpolarizing film 148 overlaying a diffuse layer 149. A backlight 150 liesbetween the diffuse layer 149 and a mirror 151. Illustratively,backlight 150 is a fluorescent lamp but backlight 150 may be othersources of light such as LEDs, lasers, or any other source of light.Light from backlight 150 contacts diffuse layer 149 directly orindirectly off mirror 151. Diffuse layer scatters the incoming light tocreate a diffuse light source. The diffuse light polarized by thepolarizing film 148 passes through glass filter 147 through liquidcrystal layer 145, through glass filter 143, polarizing film 142, andfinally is emitted from display unit 140 through glass cover 141. Thedisplay visible from display unit 140 will a be light pattern that hasbeen modulated by liquid crystal layer 145 under the action of voltagethat is applied to the liquid crystal layer 145 across positiveelectrode 144 and negative electrode 146 in a manner well known in theart.

FIG. 3 shows an aerial view of the display unit 140 illustrating thatthe display unit 140 is configured to form pixels which are the areasdefined by the vertical and horizontal lines shown in the FIG. 3. Twopixels 155 and 159 have been labeled to illustrate two pixels that makeup the grid of pixels shown in the checker-board pattern that makes upthe display unit in FIG. 3.

Referring again to FIG. 1, illustratively, display unit 160 is an e-inkdisplay. An illustrative cross-section of an e-ink display 160 useablewith this disclosure is shown in FIG. 4. The e-ink display 160 isillustratively a layered panel 160 comprising a transparent electrodelayer 161 overlaying a color filter 162. A liquid polymer layer 162 issandwiched between color filter 162 and lower electrode layer 164.Liquid polymer layer illustratively comprises a microcapsule 174containing negatively charged titanium dioxide particles 172 and coloredoil 175. The display visible from display unit 160 will be a lightpattern that has been modulated by liquid polymer layer 163 under theaction of voltage that is applied to the liquid polymer layer 163 acrosselectrode 161 and electrode 164. More specifically, the electrodes aredefined to have areas 177, 178, 179 which correlate to the pixel areas(as defined in connection with FIG. 4) as shown in FIG. 5. Applying apositive or negative charge onto these areas causes the negativelycharged titanium dioxide particles 172 to migrate toward or away fromthese areas depending on the charge. The attraction of the negativelycharged titanium dioxide particles 172 to the positively charged areasof the upper electrode 161 creates a white backdrop contiguous withupper electrode 161 for reflecting incident light. The attraction of thenegatively charged titanium dioxide particles 172 to the positivelycharged areas of the lower electrode 163 causes the colored oil 175 inthe microcapsule 174 to lie contiguous to the negatively charged areasof the upper electrode 161. The colored oil creates a dark backgroundcontiguous with the upper electrode 161 for producing a dark color. Thewhite and dark colors that make-up the light reflected off the whitetitanium dioxide and dark oil contiguous the upper electrode is whatmakes up the displayed text or image of the e-ink display. The above andother diffuse reflecting technology solutions for making diffusereflector displays useable with this disclosure are well known in theart.

Referring again to FIG. 1, while the illustrative display unit 140 is anLCD display and display unit 160 is an e-ink display, it will beappreciated that a wide array of display types may be used with thisdisclosure. Display types include, but are not limited to, monochromedisplays, color displays, cathode ray tube (CRT) displays, projectiondisplays, liquid crystal displays (LCDs), flat, rigid displays, flexibledisplays, electronic whiteboard displays, ruggedized displays, weatherprotected displays, waterproof displays, backlit displays, reflectivedisplays, power saving displays, etc. Other display types well known inthe art or not yet produced or conceived are equally applicable asdetachable display types that may be used in the application described.

Display unit 140 and display unit 160 may be configured within mobilecomputing device in a number of ways. FIGS. 6 and 7 illustrate mobilecomputing device 100 illustrated as a smart phone having a front side200 with a keyboard 210 and a back side 230. In one illustrativeembodiment of this disclosure, display unit 140 is located on the frontside 200 of the mobile computing device and display unit 160 is locatedon the back side 230 of the mobile computing device. In this embodiment,the readability of display unit 160 which illustratively is an e-inkdisplay improves with stronger ambient light while the readability ofdisplay unit 140 which illustratively is an LCD display degrades inthose conditions. The LCD display of display unit 140 is most readablewhen there is low or no ambient light where the diffuse reflectingdisplay of display unit 160 cannot be read in those conditions. The twodisplays together of this disclosure thus expands the lightingconditions under which the mobile computing device can be read. The LCDdisplay of display unit 140 can be used in low lighting conditions whilethe diffuse reflecting display of display unit 160 can be used where theambient lighting is high, such as on the beach. When outside and the sunis shining, the user is able to read, for example using the diffusereflecting display. In darker ambient conditions, the user may defer tousing the LCD display. Similarly, a delivery woman can read the e-ink ona diffuse reflecting display in the bright sunlight. In one device shecan also use the LCD display in lower lighting conditions for moresophisticated interactive applications where the low refresh rates ofthe diffuse reflecting display are inhibiting.

With the diffuse reflecting display as part of the mobile computingdevice, the user always has the option of using the diffuse reflectingdisplay for performing mobile computing device functions in order toextend the life of the mobile computing device based on the chargeavailable to the display from the battery. This is because the diffusereflecting display requires less power than the LCD display which drawssignificant power due to the continual need to refresh the display andto produce the back lighting. In cases where the power supply is low andso use of the LCD display is no longer an option, the mobile computingdevice may display an alert 220 as shown in FIG. 6 of the lower powercondition to the user; prompting the user to switch over to use of thediffuse reflecting display as described below. Alternatively, theprocessor may be programmed to automatically switch sending informationto be displayed from the LCD display unit over to the diffuse reflectingdisplay unit on the occurrence of the low power condition. Hence, on theoccurrence of the event, the diffuse reflecting display unit will begindisplaying the stream of information that the processor previouslydisplayed on the LCD display unit. Either feature may allow the user tocontinue to perform mobile computing functions on the mobile computingdevice long after a conventional mobile computing device would have shutdown because of the absence of required power to drive the LCD display.

A particularly dangerous failure of a mobile computing device can occurwhen the LCD display become inactive not because of lower powerrequirements but because the LCD display has failed. In those cases, theuser must resort to some external device to retrieve data from themobile computing device. For example, the user may tether the mobilecomputing device to an external display to retrieve that data.Advantageously, the second display unit of this disclosure provides aredundancy back-up display for use in this case. Where an externaldisplay or other device is not available at the time that the LCDdisplay fails, the back-up display of this disclosure may provide theonly way that a user may be able to extract data from his mobilecomputing device in that situation.

In some of the illustrative examples, only the diffuse reflectingdisplay unit is active. In some examples, the LCD display unit isdeactivated on account of either low power requirements or LCD displayunit failure. In another example, the LCD display unit may bedeactivated to conserve power when only the diffuse reflecting displayunit is needed.

Another benefit of this disclosure is that when the LCD display unit isdeactivated on account of low or no power, the text or image displayedon the diffuse reflecting display unit will generally be displayed evenif the battery goes low or dead since the diffuse reflecting displayrequires little or no refresh. Hence, even if the battery goes low ordead, the text or image displayed on the diffuse reflecting displayprior to the power cut-off or turn-off of the LCD display unit or themobile computing device generally remains readable to the user which mayprovide many benefits. For example, if the image is a bar code of aboarding pass required by a user to check-in at the airport or to passthrough a gate to board a flight, the display of the bar code on thediffuse reflecting display will be held on the diffuse reflectingdisplay unit long after the available power of the mobile computingdevice goes low or dead. This allows the user to have his bar codereadable at the airport terminal or gate long after the power of hismobile computing device has gone low or away.

Indeed, this illustrates another power management feature of thisdisclosure. At the airport, for example, the user may display hisboarding pass on the diffuse reflecting display and then turn off hismobile computing device to conserve power or for security or for someother purpose or even accidentally. The diffuse reflecting display willhold the image of his boarding pass for use at the airport while at thesame time the mobile computing device is saving power for when it maynext be needed. The diffuse reflecting display unit of this disclosuremay advantageously hold the displayed text or image for any purpose whenthe mobile computing device is power low or powered down intentionallyor unintentionally.

Display of a text or image on a diffuse reflecting display beforeturn-off of the mobile computing device provides a powerful tool for auser. The diffuse reflecting display may continue to display importantinformation to the user long after power-off. This information may be aboarding pass as in the previous example. It may also be any otherinformation that the user may want to have readily available after powerdown of the mobile computing device. For example, the diffuse reflectingdisplay may display a flight itinerary after a mobile computing deviceis powered off, for example to go through security. The diffusereflecting display may display an agenda for a business or a lunchmeeting where the mobile computing device has been or is required to beturned off. The diffuse reflecting display may display a speech that canbe used while the mobile computing device is powered off. A passenger onan airplane may even use his mobile computing device to read text orimages that were displayed on the diffuse reflecting display unit priorto power down and the passenger may even do so while the plane istaking-off or landing where mobile computing devices are generallyrequired to be powered off due to flight regulations. The disclosuremakes this and all other display of information from a mobile computingdevice after power down possible because the diffuse reflecting displaygenerally holds the text or image displayed even after the mobilecomputing device has been powered off.

The foregoing and other examples illustrate the flexibility provided byproviding a mobile computing device with two display units in accordingto the disclosure. Either or both displays are available to the user andone or both may be active; thereby expanding the range of use to which amobile computing device may be put.

The discussion above illustrates the valuable power managementcapability provided by the multiple display units of this disclosure.The diffuse reflecting display unit provides an alternate display to anLCD display to minimize power usage and extend the use of the mobilecomputing device when the mobile computing device is operating off abattery. It provides a display for use when there is no longersufficient power remaining in the mobile computing device battery todrive the LCD display or the mobile computing device. It also provides abackup display in the event that the LCD display fails. This disclosureenables the user to better manage power usage as well as the life of amobile computing device.

In addition, there may be instances when a user may only need toactivate the LCD display unit and not the diffuse reflecting displayunit. This disclosure provides for uses of one or both display unitsdepending on the needs of the user.

With the dual display capability provided by the disclosure, a user maythrottle between the LCD display and the diffuse reflecting display asneeded to perform more sophisticated interactive applications on the LCDdisplay as needed, and less sophisticated operations on the diffusereflecting display to conserve power usage.

FIG. 8 shows another illustrative embodiment where both the firstdisplay unit 140 and the second display unit 160 are located on the sameside of the mobile computing device. By having both LCD and diffusereflecting displays available, the user can throttle back betweendisplays based on lighting requirements, power availability, andsophistication of the mobile computing function required. FIG. 8A showsan illustrative embodiment where the second display 160, illustrativelya diffuse reflecting display, is configured to frame the first display140, illustratively an LCD display, in a frame configuration.

One of the other benefits served by this disclosure capitalizes on thelow refresh and power requirements of the diffuse reflecting display.One of the biggest drains on power usage on a mobile computing device isthe use of the computer to determine life data such as time of day,compass location, GPS location, battery availability, etc. It may alsoinclude other data for which a low refresh update may be satisfactorysuch as the temperature, expected highs, weather, stock, or otherinformation for which a low refresh update may be satisfactory.

FIG. 9 shows a mobile computing device 100 in the form factor of anindustrial grade handheld terminal that is provided with an LCD display140 and an diffuse reflecting display 160 displaying life data includingtime of day 310, compass bearing 305, GPS location 308, and power gauge302. In this example, part or all of the diffuse reflecting display 160is configured to provide a dashboard 300 of the foregoing and other typeof life data. This dashboard of life data is readily available to theuser, is always visible on account of diffuse reflecting technologysolutions holding its data, and is readily available without drainingthe battery such as occurs when this life data is retrieved using LCDdisplays. The LCD display unit 140 which illustratively is displaying akeypad is available to the user for sophisticated mobile computingfunctions as needed. In the embodiment of FIG. 9, the handheld terminalmay also provided with a scanning functionality (not shown) to enableindustrial scanning operations.

FIG. 10 shows the mobile computing device of FIGS. 6 and 7 except thatthe first display unit 140 and a second display unit 340 are both LCDdisplays and the second display unit 340 is configured to function as amouse. Alternatively, the second display unit may be configured to serveas a mouse pad. Illustratively, a keyboard 210 or other active buttons,such as icons, are displayed on display unit 140 which is facing theuser for easy navigation and activation using a thumb 350. At the sametime, a finger 360 may be used to navigate the mouse or the mouse pad onthe back of the mobile computing device. The second display unit detectstwo-dimensional movement of the finger over the second display unit 340which processor 104 (shown in FIG. 1) translates into the motion of apointer that appears on the first display unit 140. This disclosure thusenables thumb and finger action on both front and back side of mobilecomputing device 100 which is ergonomically friendly and improvescomputing efficiency.

In another illustrative embodiment shown in FIG. 11, the first displayunit 140 configured to provide a back lit display and the second displayunit 160 configured to provide a diffuse reflecting display areintegrated into a single display package so as to lay one over theother. In this embodiment, the second display unit 160 overlays displayunit 140 in order to allow for the backlighting hardware that isrequired to generate a display from display unit 140. To display fromthe LCD display unit 140, the upper display is placed into a“transparent mode” of operation which makes the upper display generallytransparent to information that is being displayed from the LCD displayunit 140 that lies beneath it. To display from the diffuse reflectingdisplay unit 160, the LCD display unit 140 is preferably inactivated bydeactivation of the backlighting and the upper display is placed into an“active” mode of operation in order to make the upper displayreflective. In this way, ambient light reflecting off diffuse reflectingdisplay unit 160 exhibits information displayed on the diffusereflecting display unit 160. Alternatively, the LCD display unit 140 maybe placed above diffuse reflecting display unit 140 although placementof the LCD display unit below the diffuse reflecting display unit may bemore efficient because it makes more real estate available for thebacklight and driving electronics and reduces the path that reflectivelight has to travel in connection with the diffuse reflecting displayunit.

An additional embodiment of the invention comprises a combination of atransparent electronic paper display and using a laser based projectingdisplay similar to the kind developed by Microvision or FraunhoferInstitute for the backlit display unit 140.

In another illustrative embodiment shown in FIG. 12, the diffusereflecting display unit layer 160 overlays backlit display unit layer140. Each layer defines a grid 382 and 384 of vertical and horizontallines forming a checkerboard of square areas. Some but not all of thesquare areas in each layer would serve as active pixels for the displayprovided by the layer. For example, FIG. 12 shows two pixels of thediffuse reflecting layer 372, 374 to be active (i.e., capable ofreflecting information) while corresponding pixels of the LCD layer 376,378 lying directly beneath pixels 372, 374 are shown to be inactive(i.e. no back light shines through pixels 376, 378 to interfere with theactive overhead pixels 372, 374). Similarly, two pixels of the diffusereflecting layer 382, 384 are shown be inactive (i.e., transparent toallow LCD lighting from below these pixels to pass through) whilecorresponding pixels of the LCD layer 386, 388 directly beneath pixels382, 384 are shown to be active (i.e., gateably capable of displayingLCD display information). In this way, the pixels of each layer can bealternatively activated by the processor so that neither layerinterferes with the other layer when displaying information outwardlyfrom the display device.

As yet another illustrative embodiment, the inactive pixels 382, 384 inthe reflective layer 160 shown in FIG. 12 may be configured to beneither active pixels, nor inactive pixels. Rather, pixels 382, 384 maybe configured to be “transparent” pixels. In this embodiment, theinformation in the pixels in lower LCD layer 140 that line up with thetransparent pixels in the reflective layer would shine right through thetransparent pixels without any need for activation or deactivation ofthe pixels 382, 384. These “transparent” pixels thus form gaps betweenactive/inactive pixels that are transparent to the backlight. It will beappreciated that the “transparent” pixels may be located in variousconfigurations across the checkerboard shown in FIG. 12 depending uponthe desired display effect. For instance, in one configuration, one“transparent pixel” may be located between two active pixels across thecheckerboard of pixels that make up the layer. In another configuration,a plurality of transparent pixels may be located between two activepixels across the checkerboard of pixels in order to allow for morebacklighting effect. In yet another configuration, in one or more partsof the checkerboard, one or more transparent pixels may be locatedbetween active pixels while in a second part or parts of thecheckerboard, a different number of transparent pixels may be locatedbetween active pixels of the checkerboard, and in a third part or part,there may be no transparent pixels between adjacent active pixels. Inthese and other ways, transparent pixels may be used to allow for moreor less backlighting to shine through reflective layer 160 to producethe desired combination of backlighting or reflective lighting displayeffects from mobile computing device. In these and other ways,individual pixels or sectors of pixels may be configured to betransparent.

Referring again to FIG. 1, display panel interface 110 may be anyhardware and/or hardware/software components that detect a property foractivating a display type. The processor 104 is configured to sendinformation to be displayed to the first display unit 140 or the seconddisplay unit 160 depending on the display type property detected.Illustratively, the display panel interface is a touch activated sensorand the property detected for activating the display type is a touchdetected by the sensor.

FIGS. 13 and 14 show one illustrative embodiment of this disclosure.FIGS. 13 and 14 are similar to FIGS. 6 and 7 and the description ofelements that are described in connection with FIGS. 6 and 7 and thatare common to FIGS. 13 and 14 are applicable to the like elementsappearing in FIGS. 13 and 14. The mobile computing device of FIGS. 13and 14 further comprise a first touch activated sensor 410 associatedwith the first display unit 140 and a second touch activated sensor 420associated with the second display unit 160. The previously describedtouch detected by the touch activated sensor is in this case a touchdetected by the first touch activated sensor 410 or a touch detected bythe second touch activated sensor 420. The touch detected by the firsttouch activated sensor activates the first display unit 140 and thetouch detected by the second touch activated sensor activates the seconddisplay unit 420 in this embodiment.

In an illustrative embodiment using a single touch activated sensor, thedisplay panel activated by the display panel interface on detection of atouch by the touch activated sensor may depend upon the form of thetouch. The form of the touch may be the number of times that the touchactivated sensor is touched. For example, a first number of times oftouch of the touch activated sensor, such as one touch, may activate thefirst display unit and a second number of times of touch of the touchactivated sensor, such as two touches, may activate the second displayunit. Alternatively, the form of the touch may be the number of fingersthat touch the touch activated sensor. For example, a first number offingers, such as one finger, touching the touch activated sensor mayactivate the first display unit and a second number of fingers, such astwo fingers, touching the touch activated sensor may activate the seconddisplay unit.

In another illustrative embodiment, the display panel interface is agravity detection device 490, such as an accelerometer, and the propertydetected for activating the display type depends on which of the firstdisplay unit or the second display unit is facing in the upwarddirection. In one example, accelerometer 490 is configured to detectwhether the front side 200 of mobile computing device 100 is facing up.The LCD display panel 140 is activated if the front side of the mobilecomputing device is facing up. The diffuse reflecting display panel 160is activated if the back side of the mobile computing device is facingup. In this way, the display that the user positions to face upward isactivated by the display panel interface since the accelerometer detectsthat display to be in the upward position.

Touch, number of touches, number of fingers touching, upward anddownward position of a mobile computing device or a display unit, softkeys, etc. are some of the properties that the display panel interfacemay detect for activating a display type. Other properties including anyproperty, physical, mechanical, electrical, chemical, or other propertythat is detectable for use in selecting a display unit.

The mobile computing device shown in FIG. 1 may further comprise adisplay controller having display controller settings. The processor maybe configured to update the display controller based on the display typeproperty detected. In addition the mobile computing device may furthercomprise a memory configured to store properties of the backlit displayand the diffuse reflecting display.

FIGS. 15, 16, 17 illustrate the same mobile computing device 100 in theform-factor of a claim-shell in three different positions.Illustratively, the mobile computing device is a laptop computer but themobile computing device may be other types of mobile computing devices.As shown in FIG. 15, the mobile computing device comprises a displaypart 510, a keyboard part 520, and a swivel member 530 connecting thedisplay part to the keyboard part of the mobile computing device toallow the display part of the mobile computing device to rotate aboutthe swivel member when the display part is substantially orthogonal tothe keyboard part of the mobile computing device. As shown in the FIGS,the first display unit 140 and the second display 160 unit reside in thedisplay part of the mobile computing device. Advantageously, the swivelmember 530 allows either the first display unit or the second displayunit to face in the direction of the keyboard part of the mobilecomputing device for use in a first set of operations. In FIG. 15,display unit 160 is facing the keyboard part of the mobile computingdevice.

FIG. 16 shows the display panel 510 having swiveled about 270 degrees570 about the orthogonal axis 560 formed by the swivel member 530 suchthat the LCD display unit 140 is now almost facing the direction of thekeyboard. Advantageously, when the LCD display unit is facing the user,this allows the user to perform a first set of operations using the LCDdisplay panel. In addition, the display unit 160 facing away from thekeyboard part of the mobile computing device enables use of the facingaway display unit in a second set of operations. For example, anotherperson may read a book on the diffuse reflecting display of display unit160 while a first person may be using the LCD display 140 to performsophisticated computing applications.

FIG. 17 shows the display unit 160 facing away from the keyboard part ofthe mobile computing device configured to be the display face of themobile computing device when the display part is closed onto thekeyboard part of the mobile computing device. Advantageously, thedisplay face of the mobile computing device when the display part isclosed onto the keyboard part of the mobile computing device may serveas a tablet. If the mobile computing device is a laptop computer, thisfeature enables the laptop computer to be transformed into a tablet inaccordance with this disclosure. A claim-shell mobile smart phone mayprovide a smaller tablet when the phone is configured according to thisdisclosure.

Another powerful use of the externally facing display face of the mobilecomputing device both when the externally facing display face isorthogonal to the keyboard part of the mobile computing device or evenafter the display part is closed onto the keyboard part of the mobilecomputing in the prior example is that the display face becomes the“face” of the mobile computing device to those on the other side of thekeyboard of the mobile computing device that are facing the externallyfacing display. Hence, the outwardly facing display may be used todisplay text or an image that may provide the mobile computing devicewith an identity or signature. The face may display a color or a messageand the colors, messages, etc. may change after one or morepredetermined time periods. Users, such as teenagers may use the face todisplay messages to other teenagers at the same time that they are usingthe inwardly facing display for a specific purpose. The disclosure thusallows communication with others using the externally facing displayunit “face” of the mobile computing device. The face may provide amessaging board for use in communicating messages from the externallyfacing display unit in the previously described second operation toothers while the user is performing the previously described first setof operations using the display unit that is facing the keyboard. Inanother example, the face may be used for advertising; wherein theexternally facing display unit may serve, for example, as a billboardboth when the externally facing display face is orthogonal to thekeyboard part of the mobile computing device or even after the displaypart is closed onto the keyboard part of the mobile computing

In a method of displaying information from a mobile computing device ofthis disclosure as shown in FIG. 18, the method, comprises the step of:detecting a property for activating a display type 600; and sendinginformation to be displayed to a first display unit or a second displayunit depending on the display type property detected 610. The method mayfurther comprise the steps of: configuring the first display unit toprovide a backlit display; and configuring the second display unit toprovide a diffuse reflecting display.

The property detected for activating the display type may be a touch.The property detected for activating a display type may be the relativeposition of the first display unit and the second display unit.

The method may further comprise the steps of: providing a displaycontroller having display controller settings, and configuring aprocessor to update the display controller based on the display typeproperty detected. The may further comprising the steps of: configuringa memory to store properties of the backlit display and the diffusereflecting display.

The method may further comprise the step of: configuring the mobilecomputing device to be a hand held terminal, a laptop computer, a smartphone, an industrial hand held terminal, or an industrial hand heldterminal with scanner. The method may further comprise the step ofconfiguring the second display unit to serve as a mouse. Alternatively,the second display unit may be configured to serve as a mouse pad.

The method may further comprise the further step of: locating the firstdisplay unit on a first side of the mobile computing device; andlocating the second display unit on a second side of the mobilecomputing device. The first side of the computing device may be thefront of the mobile computing device and the second side of thecomputing device may be the back of the computing device. The method mayfurther comprise the step of: configuring the second display unit toserve as a mouse. Alternatively, the second display unit may beconfigured to serve as a mouse pad. In addition, the method may furtherinclude the step of leaving the visual display on or turning the visualdisplay off.

The method may further comprise the step of: locating the first displayunit and the second display unit on the same side of the mobilecomputing device. The side of the mobile computing device on which thefirst display unit and the second display unit are located may be thefront side of the mobile computing device.

The method may further comprise the steps of: integrating the firstdisplay unit configured to provide a back lit display and the seconddisplay unit configured to provide a diffuse reflecting display into asingle display unit so that one display unit overlays the other displayunit.

The method may further comprise the step of: configuring the e-inkdisplay of the second display to display a dashboard of information.

FIG. 19 shows a method comprising the step 701 of forming the mobilecomputing device in the form factor of a claim-shell, configuring 710the mobile computing device to include a display part, a keyboard part,and a swivel member connecting the display part to the keyboard part ofthe mobile computing device to allow the keyboard part of the mobilecomputing device to rotate about the swivel member when the display partis substantially orthogonal to the keyboard part of the mobile computingdevice; configuring 715 the first display unit and the second displayunit to reside in the display part of the mobile computing device; androtating 720 the first display unit or the second display unit of thedisplay part about the swivel member when the display part is in aposition orthogonal to the keyboard part to allow either the firstdisplay unit or the second display unit to face in the direction of thekeyboard part of the mobile computing device for use in a first set ofoperations 725.

The method may further comprise the step 730 of: using the display unitfacing away from the keyboard part of the mobile computing device in asecond set of operations. The second set of operations on the displayunit facing away from the keyboard part of the mobile computing devicemay be performed contemporaneously with the first set of operations.

The method may further comprising the step of using the display unitfacing away from the keyboard part of the mobile computing device to bethe display face of the mobile computing device when the display part isclosed onto the keyboard part of the mobile computing device.

The method may further comprise the step of configuring the display faceof the mobile computing device when the display part is closed onto thekeyboard part of the mobile computing device to operate as a tablet.

While the LCD display unit and the e-ink display units in theillustrative examples have been indicated to be on a certain side of themobile computing device, it will be appreciated that the positions ofthe display units may be switched. For example, where in FIGS. 6, 7, theLCD display panel is disclosed to be facing the front of the mobilecomputing device and the e-ink display facing the back side of themobile computing device, it will be appreciated that the positions ofthe display units can be switched. More specifically, in this example,the e-ink display panel can be configured to face the front of themobile computing device and the LCD display unit configured to face theback side of the mobile computing device. Configuring the mobilecomputing device in this way may be particularly advantageous where theprimary function of the mobile computing device is as an e-reader.Hence, the front side of the e-reader allows the user to readinformation displayed from the e-ink display while the back side of thee-reader provides the user with an LCD display to perform moresophisticated computing applications.

As another example, the one display unit may be located along a lateralside of the mobile computing device while the other display unit may belocated along a front or back side of the mobile computing device suchas the front side of the device. Where the display unit located alongthe lateral side of the mobile computing device is an LCD displayconfigured to serve as a mouse or mouse pad, this configuration of twodisplay units provides another ergonomic variable that may be used toexpand the use of the mobile computing device to wider applications.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the disclosed device andmethod. Other embodiments will be apparent to those skilled in the artfrom the consideration of the specification and practice of thedisclosed device and method. It is intended that the specification andexamples be considered as exemplary only, with a true scope beingindicated by the following claims and their equivalents.

What is claimed is:
 1. A handheld terminal with barcode scanningfunctionality comprising; a processor; a scanner configured to scan abarcode; a first display unit configured to provide a backlit displayconnected to the processor; a second display unit configured to providea diffuse reflecting display connected to the processor and display adashboard of information with life data of the handheld terminal that isalways visible on account of the diffuse reflecting display holding itsdata; a display panel interface configured to detect a property foractivating a display type; wherein the processor is configured to sendinformation to be displayed to the first display unit or the seconddisplay unit or both depending on the display type property detected;wherein the display panel interface is a sensor and the propertydetected for activating the display type is a property detected by thesensor; wherein the handheld terminal further comprises a display part,a keyboard part, and a swivel member connecting the display part to thekeyboard part of the handheld terminal to allow the display part of thehandheld terminal to rotate about the swivel member when the displaypart is substantially orthogonal to the keyboard part of the handheldterminal; wherein the first display unit and the second display unitreside in the display part of the handheld terminal; and wherein theswivel member allows either the first display unit or the second displayunit to face in a direction of the keyboard part of the handheldterminal for use in a first set of operations.
 2. The handheld terminalwith barcode scanning functionality of claim 1 wherein the diffusereflecting display is based on e-ink technology.
 3. The handheldterminal with barcode scanning functionality of claim 1: wherein thesensor is a touch activated sensor comprising a first touch activatedsensor associated with the first display unit and a second touchactivated sensor associated with the second display unit, wherein thetouch detected by the touch activated sensor is a touch detected by thefirst touch activated sensor or a touch detected by the second touchactivated sensor, and wherein the touch detected by the first touchactivated sensor activates the first display unit and the touch detectedby the second touch activated sensor activates the second display unit.4. The handheld terminal with barcode scanning functionality of claim 1wherein the display panel interface is a gravity detecting device, andthe property detected for activating the display type depends on whichof the first display unit or the second display unit is facing in anupward direction.
 5. The handheld terminal with barcode scanningfunctionality of claim 1, further comprising a memory configured tostore properties of the backlit display and the diffuse reflectingdisplay.
 6. The handheld terminal with barcode scanning functionality ofclaim 1, wherein the second display unit is configured to serve as amouse pad or a mouse.
 7. The handheld terminal with barcode scanningfunctionality of claim 1 wherein the first display unit and the seconddisplay unit are located on a front side of the handheld terminal. 8.The handheld terminal with barcode scanning functionality of claim 1wherein the second display unit configured to provide diffuse reflectingdisplay overlays the first display unit configured to provide a back litdisplay.
 9. The handheld terminal with barcode scanning functionality ofclaim 1 wherein the first display unit configured to provide a back litdisplay overlays the second display unit configured to provide a diffusereflecting display.
 10. The handheld terminal with barcode scanningfunctionality of claim 1 wherein the display unit facing away from thekeyboard part of the handheld terminal is used in a first set ofoperations.
 11. The handheld terminal with barcode scanningfunctionality of claim 10: wherein the display unit facing toward thekeyboard part of the handheld terminal is used in a second set ofoperations.
 12. The handheld terminal with barcode scanningfunctionality of claim 11: wherein the second set of operations that arebeing performed using the display unit facing toward the keyboard partof the handheld terminal are performed contemporaneously with the firstset of operations that are being performed using the display unit facingaway from the keyboard part of the handheld terminal.
 13. The handheldterminal with barcode scanning functionality of claim 11 wherein thedisplay unit facing away from the keyboard part of the handheld terminalis configured to provide the display face of the handheld terminal whenthe display part is closed onto the keyboard part of the handheldterminal.
 14. The handheld terminal with barcode scanning functionalityof claim 13 wherein the display face of the handheld terminal serves asa tablet when the display part is closed onto the keyboard part of thehandheld terminal.
 15. A method of displaying information from ahandheld terminal with barcode scanning functionality, comprising:detecting a property for activating a display type; sending informationto be displayed to a first display unit configured to provide a backlitdisplay or a second display unit configured to provide a diffusereflecting display depending on the display type property detected;wherein the property detected for activating a display type is a touch;wherein the second display unit is configured to display a dashboard ofinformation with life data of the handheld terminal that is alwaysvisible on account of the diffuse reflecting display holding its data;configuring the handheld terminal to include a display part, a keyboardpart, and a swivel member connecting the display part to the keyboardpart of the handheld terminal to allow the keyboard part of the handheldterminal to rotate about the swivel member when the display part issubstantially orthogonal to the keyboard part of the handheld terminal;configuring the first display unit and the second display unit to residein the display part of the handheld terminal; and rotating the firstdisplay unit or the second display unit of the display part about theswivel member when the display part is in a position substantiallyorthogonal to the keyboard part to allow either the first display unitor the second display unit to face in a direction of the keyboard partof the handheld terminal for use in a first set of operations.